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Magnetic recording disk drive with data written and read as cross-track magnetizations

a magnetic recording and data technology, applied in the field of magnetic recording disk drives, can solve the problem that the guard band is not capable of generating a magnetic field

Inactive Publication Date: 2006-07-18
HITACHI GLOBAL STORAGE TECH NETHERLANDS BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

"The invention is a magnetic recording disk drive with a magnetized recording layer in the disk oriented in the cross-track direction. The drive has an inductive write head and a magnetoresistive read head capable of reading and writing cross-track magnetizations. The disk has concentric data tracks magnetically separated from each other by nonmagnetic guard bands or magnetic guard bands containing along-the-track magnetizations. The write head has erase pole and erase gap to magnetically separate adjacent data tracks. The read head has a free ferromagnetic layer and a pinned ferromagnetic layer separated by a nonmagnetic spacer layer. The read head is supported on the disk drive head carrier with the free-layer magnetization direction perpendicular to the disk surface and the pinned-layer magnetization direction parallel to the disk surface and orthogonal to the free-layer magnetization direction. The read head may be located between magnetic side shields to prevent magnetic flux from reaching the read head. The technical effects of the invention include improved data storage capacity and performance of the magnetic recording disk drive."

Problems solved by technology

The term “nonmagnetic” means that the guard band is not capable of generating a magnetic field that is detectable by the read head.
However, even if regions of the magnetic layer in the groves become magnetized, no signal is detected by the head because of the spacing h. Thus the grooves provide magnetic separation between adjacent data tracks.

Method used

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  • Magnetic recording disk drive with data written and read as cross-track magnetizations
  • Magnetic recording disk drive with data written and read as cross-track magnetizations
  • Magnetic recording disk drive with data written and read as cross-track magnetizations

Examples

Experimental program
Comparison scheme
Effect test

first embodiment

[0047]FIG. 7B is a view facing the trailing surface 325 of the slider 322 with the disk 212 in sectional view, and shows a write head formed on the slider's trailing surface. The write head includes a first patterned copper layer 350, a patterned yoke 360, and a second patterned copper layer 370; all formed by conventional lithographic patterning and deposition processes. Each copper layer 350, 370 includes a set of coil segments that are connected at their ends to form a complete coil that wraps around or surrounds the intermediate yoke 360, so that when write current is generated through the coil a magnetic field is generated across the write gap 330 by the write poles P1, P2. The ends or tips of poles P1, P2 lie substantially in the plane of the ABS slider 322 and face the disk 212. The write field is in the plane of the poles P1, P2 parallel to the slider trailing surface 325 and thus creates the cross-track magnetization in the data track 231 just beneath the write gap 330.

second embodiment

[0048]FIG. 7C is a view facing the trailing surface 325 of the slider 322 with the disk 212 in sectional view, and shows a write head formed on the slider's trailing surface. Pole portion P2 that includes a back gap BG region is plated onto surface 325 and planarized by chemical-mechanical-polishing (CMP). The pole tips PT1 and PT2 are then deposited, with PT2 making contact with P2. A conventional single layer coil C having a generally spiral pattern is plated onto surface 325 with a portion of the coil overlapping P2. Pole portion P1 is then plated over a portion of the coil C to make contact with PT1 and BG. P1 and P2 are electrically insulated from contact with coil C. The connected P1 and P2 with their respective pole tips PT1 and Pt2 form a yoke through which the coil C passes, so that when write current passes through the coil C, a magnetic field is induced across the write gap 330.

[0049]The write heads shown in FIGS. 7B and 7C are examples of a write head fabricated on the e...

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Abstract

A magnetic recording disk drive has a disk with the magnetizations in the concentric data tracks oriented in the cross-track direction. The concentric data tracks are magnetically separated from each other by guard bands. An inductive write head has its write poles and write gap oriented to generate magnetic fields in the cross-track direction. The guard bands may provide magnetic separation by containing along-the-track magnetizations, in which case the write head also has an erase pole and an erase gap to generate magnetic fields in an along-the-track direction on the sides of the data tracks. A magnetoresistive read head has its free-layer magnetization direction perpendicular to the disk surface and its pinned-layer magnetization direction parallel to the disk surface and orthogonal to the free-layer magnetization direction. The read head may have magnetic side shields spaced from it in the cross-track direction to prevent magnetic flux from adjacent data tracks from reaching the read head.

Description

RELATED APPLICATIONS[0001]This application is related to concurrently-filed application 11 / 001,265 titled “DISK DRIVE WRITE HEAD FOR WRITING CROSS-TRACK MAGNETIZATIONS” and concurrently-filed application 11 / 001,275 titled “DISK DRIVE READ HEAD FOR READING CROSS-TRACK MAGNETIZATIONS”.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]This invention relates generally to magnetic recording disk drives.[0004]2. Description of the Related Art[0005]In conventional magnetic recording disk drives the disks have concentric data tracks with regions in the data tracks magnetized in the circumferential or along-the-track direction. Data is recorded or written when these regions are magnetized by an inductive write head. The write head has write poles that generate a magnetic write field across a write gap in the along-the-track direction as the disk rotates past the write head. The written data “bits” are the transitions between successive magnetized regions in the data tracks. The...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): G11B5/02
CPCB82Y10/00B82Y25/00G11B5/012G11B5/02G11B5/127G11B5/2655G11B5/3909G11B5/3912G11B5/3967G11B5/743G11B5/31G11B2005/3996G11B2005/0005G11B5/62G11B21/02
Inventor NIKITIN, VLADIMIR
Owner HITACHI GLOBAL STORAGE TECH NETHERLANDS BV